How To Cut The Roof For A Vent

The roof rafters provide integral structural support to the roof.

How to cut the roof for a vent.

How to cut a hole for your roof air vent. Step 2 fitting the air vent. To begin the ridge vent installation they measure down 3 inches from the top of the ridge and snap a line to cut the opening for the ridge vent. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters.

Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Where the scrap wood hit the understructure of the roof we drilled a hole straight through to the outside. Using a circular saw with a carbide tip blade one of the roofers plunges the saw into the ridge at the ends and then follows the chalk line. Using your ruler measure the open area of the vent the part that will sit flush with your roof.

Before you begin cutting your hole you will need to mark out the area where you intend your vent to go. Step 1 cutting a hole. Following manufacturer s instructions for securing the vent the roofer will likely spread plastic roof cement on the underside of the vent place it over the hole slip the flange under the top side shingles and lay the flange over the down slope shingles. Once we had the pipe extension connected we figured out where the new vent pipe would need to pass through the roof using a piece of scrap wood held flush with the pipe.

If you are. Use your jigsaw or reciprocating saw to cut along the measured lines.